package com.sky.aspect;

import com.sky.annptation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类：统一为公共字段赋值
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annptation.AutoFill)")
    public void autoFillPointcut(){}

    /**
     * 前置通知 自动填充公共字段
     * @param joinPoint
     */
    @Before("autoFillPointcut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("拦截");
        // 获得方法签名对象
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
        // 获得方法上的注解
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class);
        // 获得注解中的操作类型
        OperationType operationType = autoFill.value();
        // 获取当前目标方法的参数
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }
        // 实体对象
        Object entity = args[0];
        // 准备赋值的数据
        LocalDateTime time = LocalDateTime.now();
        Long empId = BaseContext.getCurrentId();

        if (operationType == OperationType.INSERT){
            // 获得set方法对象-----Method
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                // 通过反射调用目标对象的方法
                setCreateTime.invoke(entity,time);
                setUpdateTime.invoke(entity,time);
                setUpdateUser.invoke(entity,empId);
                setCreateUser.invoke(entity,empId);
            } catch (Exception e) {
                log.error("公共字段填充失败：{}", e.getMessage());
                e.printStackTrace();
            }
        }
        try {
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            setUpdateTime.invoke(entity,time);
            setUpdateUser.invoke(entity,empId);
        } catch (Exception e) {
            log.error("公共字段填充失败：{}", e.getMessage());
        }


    }

}
